$h/e$ Oscillations in Interlayer Transport of Delafossites

Abstract

Transport of electrons in a bulk metal is usually well captured by their particle-like aspects, while their wave-like nature is commonly harder to observe. Microstructures can be are fully designed to reveal the quantum phase, for example mesoscopic metal rings resembling interferometers. Here we report a new type of phase coherent oscillation of the out-of-plane magnetoresistance in the layered delafossites PdCoO${}_2$ and PtCoO${}_2$. The oscillation period is equivalent to that determined by the magnetic flux quantum, $h/e$, threading an area defined by the atomic interlayer separation and the sample width. The phase of the electron wave function in these crystals appears remarkably robust over macroscopic length scales exceeding 10$\mu$m and persisting up to elevated temperatures of $T$>50K. We show that, while the experimental signal cannot be explained in a standard Aharonov-Bohm analysis, it arises due to periodic field-modulation of the out-of-plane hopping. These results demonstrate extraordinary single-particle quantum coherence lengths in the delafossites, and identify a new form of quantum interference in solids.

References in corpus (15)

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• Aharonov-Bohm effect in graphene
• The properties of ultrapure delafossite metals
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• Aharanov-Bohm excitons at elevated temperatures in type-II ZnTe/ZnSe quantum dots
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• Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO${}_2$
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Cited by in corpus (18)

• Directional ballistic transport in the two-dimensional metal PdCoO2
• Quasiparticle interference and quantum confinement in a correlated Rashba spin-split 2D electron liquid
• Distinct switching of chiral transport in the kagome metals KV${}_3$Sb${}_5$ and CsV${}_3$Sb${}_5$
• Low-symmetry non-local transport in microstructured squares of delafossite metals
• Metallic delafossite thin films for unique device applications
• Determination of the phase coherence length of PdCoO${}_2$ nanostructures
• Finite-size effects of electron transport in PdCoO${}_2$
• Unraveling the unusually high electrical conductivity of the delafossite metal PdCoO${}_2$
• Emergent magnetism with continuous control in the ultrahigh conductivity layered oxide PdCoO2
• Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures
• Bloch-Lorentz magnetoresistance oscillations in delafossites
• Fully two-dimensional incommensurate charge modulation on the Pd-terminated polar surface of PdCoO2
• Li${}_2$Sr[MnN]${}_2$: a magnetically ordered, metallic nitride
• $T-$linear resistivity from magneto-elastic scattering: application to PdCrO${}_2$
• Optimizing energy conversion with nonthermal resources in steady-state quantum devices
• Disorder-enhanced effective masses and deviations from Matthiessen's rule in PdCoO${}_2$ thin films
• Intrinsic defect intolerance in the ultra-pure metal PtSn${}_4$
• Breathing mode in open-orbit magnetotransport: a magnetic lens with a quantum mechanical focal length